Finding the Fourth Proportional to 1,086.72, 1,631.07 and 599.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.72 : 1,631.07 = 599.10 : x
2. Step 2: Convert to fraction form
   1,086.72/1,631.07 = 599.10/x
3. Step 3: Cross multiply
   1,086.72x = 1,631.07 × 599.10
4. Step 4: Simplify right side
   1,086.72x = 977,174.04
5. Step 5: Solve for x
   x = 977,174.04/1,086.72
6. Step 6: Final answer
   x = 899.20